Synthesis, characterization, and catalytic performance of Aluminum and Tin Compounds with β-diketiminato ligand

Two new tin (II) and tin (IV) compounds [LSnCl] (1) and [LSnCl₃] (2), bearing the β-diketiminato ligand LH (L = HC(CMeNAr)₂, Ar = 2,6-Et₂C₆H₃) were synthesized by the reactions of LH with n-BuLi, then respectively with SnCl₂ and SnCl₄. Two new aluminum alkyl compounds, [LAlMe₂] (3) and [LAlEt₂] (4), were synthesized in high yield from the reactions of LH with AlMe₃ and AlEt₂, respectively. Compound [LAlI₂] (5) was synthesized from the reaction of 3 with I₂ in good yield. All these main group metal compounds bearing β-diketiminato ligand LH were fully characterized by ¹H NMR and ¹³C NMR spectroscopy, and elemental analysis. Meanwhile, compounds 1, 2, 3, and 5 were characterized by single crystal X-ray structural analysis. Moreover, the well-defined compounds 1–4 were investigated to show good catalytic activity in hydroboration of terminal alkynes.